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Chatangiella manumii
Chatangiella manumii, (Vozzhennikova, 1967), Lentin and Williams, 1976
Sr. homonym of Chatangiella manumii (Cookson and Eisenack, 1970) Lentin and Williams, 1976.
Lentin and Vozzhennikova, 1990, provided an expanded description for this species.
Holotype: Vozzhennikova, 1967, pl.108, fig.3; Lentin and Vozzhennikova, pl.4, fig.3, text-fig.19
Locus typicus: Kazakhstan (Kustanai), Russia
Stratum typicum: Turonian-Campanian
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Original description Cooksoniella manumii: [Vozzhennikova, 1967, p. 184-185]: (Translation: Lentin and Vozzhennikova, 1990):
Description:
Theca ovalpentagonal, tabulated and divided into almost equal parts.
Epitheca triangular, with convex lateral walls or somewhat tapering at the level of the top of the internal body, after which the walls diverge somewhat before coming together to give a conical apical horn which is bluntly truncated at the distal end.
Hypotheca trapeziform with two antapical horns of different size. One is short and rounded at the end and may be barely discernible; the other is considerably large, acutely pointed and triangular in outline, although sometimes it may be blunt-ended and slightly curved. Transverse furrow equatorial, annulate, and between its ends there is a depression, corresponding in position to the longitudinal furrow and extending a little way onto the epitheca as well as reaching almost to the end of the hypotheca.
Theca divided into fields, the boundaries of which are marked by pointed spines. Similar spines occur more sparsely on the surface of the plates and more densely along the margins of the furrows. In many specimens there are small areas between the fields which are devoid of sculpturing and probably correspond to the sutures of tabulated peridinia. The number of fields has not yet been determined accurately.
The internal body is oval and occupies the central part of the theca; its lateral walls are adjacent to, or at some distance from, the thecal walls which in turn vary in thickness. Pylome oval-hexagonal.
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Expanded description:
Lentin and Vozzhennikova, 1990, p. 43:
Description:
Cyst outline elongate rectangular with, a short apical horn between poorly developed shoulders and a convex pericingular region; antapex with two antapical horns, with the left antapical horn more developed, right antapical horn usually poorly developed; endocyst round in outline, dividing the cyst equally; bicavate to occasionally circumcavate.
Periphragm smooth with common, small intratabular spines; endophragm thin, finely granulose.
Paratabulation peridinioid indicated by archeopyle and intratabular spines.
The periarcheopyle is iso-omegaform with the 4" - 2a suture about one third the length of the 2a 3" suture, operculum remains attached along the 4" - 2a suture; the endoarcheopyle is 3I or undeveloped; an opisthopyle may be formed by an arcuate suture on the mid-ventral surface of the hypocyst.
The paracingulum is outlined by parallel ridges of spines, pentapartite.
Parasulcus indicated by a depression on the hypocyst which does not contain spines.
Dimensions:
Holotype, length of pericyst 67.5 µm, width 46 µm, width of paracingulum 6 µm, length of endocyst 35 µm, width of endocyst 38 µm. Length of archeopyle 16 µm, width 17 µm.
Range, length 62-72 µm, breath 38-51 µm, width paracingulum 5-6 µm, length of endocyst 30-40 µm. breadth 35-46 µm.
Sr. homonym of Chatangiella manumii (Cookson and Eisenack, 1970) Lentin and Williams, 1976.
Lentin and Vozzhennikova, 1990, provided an expanded description for this species.
Holotype: Vozzhennikova, 1967, pl.108, fig.3; Lentin and Vozzhennikova, pl.4, fig.3, text-fig.19
Locus typicus: Kazakhstan (Kustanai), Russia
Stratum typicum: Turonian-Campanian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description Cooksoniella manumii: [Vozzhennikova, 1967, p. 184-185]: (Translation: Lentin and Vozzhennikova, 1990):
Description:
Theca ovalpentagonal, tabulated and divided into almost equal parts.
Epitheca triangular, with convex lateral walls or somewhat tapering at the level of the top of the internal body, after which the walls diverge somewhat before coming together to give a conical apical horn which is bluntly truncated at the distal end.
Hypotheca trapeziform with two antapical horns of different size. One is short and rounded at the end and may be barely discernible; the other is considerably large, acutely pointed and triangular in outline, although sometimes it may be blunt-ended and slightly curved. Transverse furrow equatorial, annulate, and between its ends there is a depression, corresponding in position to the longitudinal furrow and extending a little way onto the epitheca as well as reaching almost to the end of the hypotheca.
Theca divided into fields, the boundaries of which are marked by pointed spines. Similar spines occur more sparsely on the surface of the plates and more densely along the margins of the furrows. In many specimens there are small areas between the fields which are devoid of sculpturing and probably correspond to the sutures of tabulated peridinia. The number of fields has not yet been determined accurately.
The internal body is oval and occupies the central part of the theca; its lateral walls are adjacent to, or at some distance from, the thecal walls which in turn vary in thickness. Pylome oval-hexagonal.
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Expanded description:
Lentin and Vozzhennikova, 1990, p. 43:
Description:
Cyst outline elongate rectangular with, a short apical horn between poorly developed shoulders and a convex pericingular region; antapex with two antapical horns, with the left antapical horn more developed, right antapical horn usually poorly developed; endocyst round in outline, dividing the cyst equally; bicavate to occasionally circumcavate.
Periphragm smooth with common, small intratabular spines; endophragm thin, finely granulose.
Paratabulation peridinioid indicated by archeopyle and intratabular spines.
The periarcheopyle is iso-omegaform with the 4" - 2a suture about one third the length of the 2a 3" suture, operculum remains attached along the 4" - 2a suture; the endoarcheopyle is 3I or undeveloped; an opisthopyle may be formed by an arcuate suture on the mid-ventral surface of the hypocyst.
The paracingulum is outlined by parallel ridges of spines, pentapartite.
Parasulcus indicated by a depression on the hypocyst which does not contain spines.
Dimensions:
Holotype, length of pericyst 67.5 µm, width 46 µm, width of paracingulum 6 µm, length of endocyst 35 µm, width of endocyst 38 µm. Length of archeopyle 16 µm, width 17 µm.
Range, length 62-72 µm, breath 38-51 µm, width paracingulum 5-6 µm, length of endocyst 30-40 µm. breadth 35-46 µm.